radial-line-circle-intersection-x-y

Arguments: point-x point-y circle-center-x circle-center-y radius

Returns as multiple value the coordinates of the point on the edge of a circle where it is crossed by a line that passes through the center of the circle and through an arbitrary point. Returns nil if the circle center and the arbitrary point are the same.

The first two arguments are real numbers for the X and Y coordinates of the arbitrary point. The third and fourth arguments are real numbers for the coordinates of the center of the circle, and the last argument is a real number for the radius of the circle. Returns two real numbers for the X and Y coordinates of the intersection point, or nil.

See also radial-line-circle-intersection.

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Created 2012.5.30.